Advanced Materials Research Vols. 1092-1093

Abstract: The difference of movable fluid saturation of tight sandstone gas reservoir is researched, with transverse relaxation time (T₂) distribution derived from nuclear magnetic resonance technique (NMR). This article newly calculate T₂ cutoff value and elaborate the influence of pore structure on the occurrence characteristics of movable fluid. The study had revealed T₂ spectrum distribution includes the following types: (1) wide and flat single peak; (2) left single peak; (3) high left peak with low right peak. Movable fluid saturation is low, with class IV and class V movable fluid mainly. Pore structure control properties and percolation ability of rock reservoir and whether oil could be driven out depends on throat parameters of interconnected pores. Movable fluid saturation is low with bigger pore throat ratio, narrower pore throat distribution and higer pore structure heterogeneity.

Abstract: According to the practical engineering in Daxing Coal Mine north limb centralized down transportation, the No 13 coal seam rock cross-cut area with high gas pressure and content was serious outburst hazardof. Based on the technical principle and protection outburst mechanism of hydraulic in depressurization and enhanced permeability, the hydraulic drills in rock cross-cut coal uncovering were desinged, and the hydraulic equipment was matched, the measures were constructed, the effect was tested. The results show that the new type integration technology of the integrative hydraulic drilling and reaming obvious increased the plasticity of coal, reduced the stress concentration region of coal seam, improved the permeability of coal, promoted gas release, enhanced the ability of preventing coal and gas breakout, which played an active role in comprehensive outburst controlling, obtain ed a favourable effect in rock cross-cut coal uncovering and has important popularized and applied values.

Abstract: Through the displacement experiment of low permeability sandstone micro model of water Erdos basin, summing up the water displacing oil characteristics, and to explore the influencing factors of micro water oil displacement efficiency. The study found that, the water flooding characteristic main performance for: flooding mode mainly by non piston displacement; heterogeneity is strong, the oil displacement efficiency is low; the crude oil viscosity is low, the oil displacement efficiency is high; the main influencing factors are: physical; heterogeneity; displacement ratio. Therefore, for low permeability sandstone reservoir development, process parameters should be selected reasonably, in order to ensure the good development effect.

Abstract: Based on a large number of carbon and oxygen stable isotope data, researched environment characteristics of Ordovician carbonate rocks in Yubei area, Tarim Basin. According to carbon, oxygen stable isotopes (&¹³C, &¹⁸O) data, combining the diagenetic environment characteristics studied all kinds of geochemical characteristics of rocks in Yubei area. The research results show that: Paleosalinity feature of Ordovician carbonate rocks in this area reflected the carbonate rocks is formed in the stability of the marine environment and basically kept the composition of carbon and oxygen isotopic of the original environment. the paleo temperature characteristics indicate that the diagenetic burial depth was increased first and then decreased, the sea level characteristics indicate that the sedimentary strata by Yingshan period to Lianglitage period corresponds with a rise in sea level.

Abstract: Because of the complex geologic space body and the underground seepage conditions, it is difficult to predict groundwater water inflow in prevention and treatment control work of coal mine. To predict the groundwater flow of the coal seam under the roof sandstone aquifer in Nanshan coal, the big water well method and three-dimensional numerical model were used at the same time. The quantity of predicted normal water inflow was 553.5 m³/h by using numerical model and the big-well method is about 591.6 m³/h. The result of big-well methods was relatively close to the result of numerical simulation method, which proved the rationality of the two methods in parameters selection and model building, and greatly improved the reliability and accuracy of prediction results. Compared with large-well method, by establishing the complex 3D geological structure of underground water and fitting the parameters based on the actual data of hydrology, numerical method could simulate the process of groundwater seepage and dewatering engineering, overcome the parameter uncertainty of large-well method, improve the predictive accuracy of the mine water inflow, and has important application value.

Abstract: In this paper, a systemic and experimental research is performed on the compatibility for glutenite oil reservoir in Karamay. The velocity sensitivity is not strong in microscopic scale and not weak in macroscopic scale; strong stress sensitivity; medium water sensitivity; varied compatibilities of injected water with stratum in different blocks. Causes: badly sorted source and small pore throat; high content of varied clay minerals. Authigene sodium montmorillonite comes in large quantity and varied occurrences, water swelling and easily dispersed. The kaolinite is easy to swell, be dispersed and transferred. As the research shows, it is very important to keep the solid particle diameter shall be limited within 2μm in the injected water, maintain a high degree of mineralization of the injected water, recycle the waste water as much as possible, control the production pressure for effective development of glutenite oil reservoir in Karamay. The difference of compatibility in macroscopic scale results from the fact that Block E has high permeability but large throat radius while Block W1 and Block W2 have low permeability but small throat radius..

Abstract: When tunneling deep sandstone roadway of-350m level in Yongrong mining area, it appears frequent occurrence of rock burst and gas dynamic phenomenon. Through discussing tectonic stress field, tunneling stress field, self-weight stress field and physico-mechanical properties of middle-fine sandstone, this paper draws sandstone outburst mechanism with rock drivage in mine coal-bearing.

Abstract: The Dongzhongla Pb-Zn deposit, a newly-discovered medium-sized deposit, is located in the north margin of the eastern Gangdese, central Lhasa block. Based on the analysis of the ore-forming geological conditions in this deposit, sulfur isotope of this deposit were analyzed, and S isotopic equilibrium temperature of mineral pairs (sphalerite and galena) were calculated. This study has shown that the sulfur isotopic equilibrium temperature of sphalerite and galena in Dongzhongla Pb-Zn deposit ranged from 185℃ to 296℃. It indicated that the equilibrium temperature decreased gradually from the skarn stage to sulfide stage. The equilibrium temperature can be used as the reference of metallogenic temperature for Dongzhongla Pb-Zn deposit. DongzhongLa deposit is the typical type of skarn Lead-zinc deposit. East of the Dongzhongla mining area is the priority exploration area.

Abstract: The fractal measure on Au geochemical field of Mawangtang and Xinmengshan in Shuikoushan Pb-Zn-Au polymetallic ore field, Hunan, China was achieved by projective covering method in this paper. The results show a bifractal relation for Au Geochemical field which includes a textural fractal dimension (D₁) at small scale and a structural fractal dimension (D₂) at large scale with average breakpoint 86.0m which may be look as the movement scale of ore-forming fluid. All of fractal dimensions were between 2 to 3, D₁ was 2.0011 and D₂ was 2.0001 at Mawangtang as well as D₁ was 2.4466 and D₂ was 2.0408 at Xinmengshan respectively. The fractal dimensions appear the textural fractal dimensions were larger than their structural fractal dimensions indicate that the evolution of ore-forming fluid more complex than background value of this ore field. And what’s more, the fractal values of Mawangtang were larger than Xinmengshan may result from the mineralization with the former not only control by the overthrust structure and fold the same as the latter but also had a closed relationship with the acid to mafic magmatism.

Abstract: Guided by the theory of gas geology, from the perspective of economic and practical and efficient mine safety production, analyzed gas geological characteristics of The cui Jiagou coal mine, the geologic factors of affecting gas emission are analyzed, and sums up important factors of gas emission in mine field. at the same time use the regression analysis method, selecting three reasonable geological factors, including coal thickness, floor elevation of coal seam, and buried depth, make prediction of The cui Jiagou coal mine gas emission, prediction results conform to the actual situation, provide a solid security prevention and control of coal mining gas prediction subsequently.